I wouldn't guarantee anything, because anyone can cause damage if you abuse your car. The Flex is an orbital that also rotates at the same time, but it doesn't rotate in a perfect circle due to the orbit so it's a lot harder to cause damage than a rotary. It basically gives you the same results as an orbital a lot faster. When Nate was working on Joe's car the Flex made it look great, however the rotary was used to remove the scratches from a sideswipe that you could catch your fingernail in. The Flex might have been able to get rid of those deeper scratches too, but it would have taken a lot longer.